look up any word, like darude - sandstorm:

1 definition by Psnatch

 
1.
A difficult, yet rewarding maneuver where a minimum of three females lay on top of each other, legs spread, while a male penetrates one, then continues to move up and back down penetrating all one after another.
Requires good knee strength for males.
Bob was hardstacking the shit out of Becky, Lacie, and Shasta the other night.
Bob was hardstacking for so long he had to ice his knees.
by Psnatch April 15, 2006